CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Members' capital	Stagwell Inc. Shareholders' Equity	Convertible Preference Shares	Common Shares Common Class A & B	Common Shares Class C shares	Paid-in Capital	Accumulated Deficit	Other Comprehensive Loss	Noncontrolling Interests
Beginning balance at Dec. 31, 2019		$ 316,960
Balance (in shares) at Dec. 31, 2019				0	0	0
Balance at Dec. 31, 2019	$ 348,537		$ 316,960	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 31,577
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income prior to reorginization	74,587	56,356	56,356							18,231
Other comprehensive loss	(2,785)	(2,785)	(2,785)
Contributions	95,434	95,434	95,434
Distributions, net	(115,543)	(108,468)	(108,468)							(7,075)
Changes in redemption value of RNCI	(128)	(128)	(128)
Purchase of noncontrolling interests			0
Other	(1,559)	1,387	1,387							(2,946)
Ending balance at Dec. 31, 2020		358,756
Balance (in shares) at Dec. 31, 2020				0	0	0
Balance at Dec. 31, 2020	398,543		358,756	$ 0	$ 0	$ 0	0	0	0	39,787
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Other comprehensive loss	(5,278)
Changes in redemption value of RNCI	3,834
Purchase of noncontrolling interests			(26,538)
Ending balance at Dec. 31, 2021		$ 0
Balance (in shares) at Dec. 31, 2021				0	118,251,766	179,970,051
Balance at Dec. 31, 2021	$ 879,040		$ 370,753	$ 0	$ 118	$ 2	$ 382,893	$ (6,982)	$ (5,278)	$ 508,287